Asbestos mold.



i i e e GEORGE HALE BRABROOK,-OF TAUNTON, MASSACHUSETTS.

Asnm'ros now.

Ito Drawing 7' (II/whom it may cone-rm:

tie it known that l, Gnonon Ilani: Ba/\- nnoon.'a eitizen of the United States, residing at 'lannton. eouuty of Bristol. State of l\ia--:n-lm.-'etts. have invented a eertain new and useful Improvement. in Asbestoa Molds, oi' \vhieh the following is a s .(lfitlltltfll- My invention has for its ($300., to provide a mold for the nnnmfm'ture oi castings. and mrtienlarly ftillllt. manufacture of rantings of a delieate nature having fine linea and ornmnentatiou upon their surfaces.

The invention will bo fully uuderstmid fronr the following deseri' tlon. and the novel features thereof will pointed out amt elearly .delined in the claims at the eloae of the; apeeifieation.

Molds embodying my invention may be made in the following manner: I preferably take a number of moist sheets of asbestos paper \rhieh may be thF ordinarvasbestos paper of eommeree. and \vhieh believe to be made from asbestos fiber held together with sizinv or paste or other suitable binding material. and having also poaniblv a tilting of ehiy or similar material. 1' pan 0. the proper number of three moist, sheets together until a mum of the desired thieltnese is obtained. 'lhemoist "ax-am mass thus formed may be then llll 'ttl upon the pattern and rammed or par 'ed into the interstiees of the said pattern with a stereotyper's brush or similar tool, or in any other eonvenient manner. until a peri'eet mold is obtained. after whieh the mold is remmed from the pattern: or. if more eonvenient, may be partially dried upon the. pattern. under press-wire. i then apply to.'tbe nut-fare of the meld a faring material of some suitable kind and replaee the meld upon the pattern lllltl. l'|lllt' it againythewby eaueing the faring material to take the impremion oftheqialteru an that. thamold in left with a smooth 'ahnmt polished surfaec whieh in tree from disturbed fibers and unevenneasen. if moro convenient. the faring material may be applied to the asbestos mass before the sumo is placed upon the pattern and rammed. In praetico i find ithest to use fuciug material in the manner deaeribed in my a plication for process of molding. filed Niwember 9. I004. Serial No. 232.050. in the proees there. deaeribed, T apply a facing eompmed of some auitable ineombnatihle and non-furiblo faring material, aueh as German or Front-h burnt sand in the form lpuciucation at Letter: Intent. Patented Oct. 18, 1010. Application filed July M, 1805. flcrial Io. 8,718.

of an im nlpable owder, ahd capable of 'lillhllll'lt mg a hint degree of heat. mixed with a volatile liquidhydro-carbon (preferably benzene non-mixahle with water; The said feeing material and volatile liquid are preferably mixed together in the proportions of one third of a pint of the faein material to one pint of t to liquid, and tlna mixture is then sprayed or otherwise applied to the nnrfaee of the u bestos in a tlnn piisty or semi-pla tie eonditzon, so as to'fill the interstices in the surfaeo of the mold a'nd form a skin or layer on saidsnrfaee. 'ihe benzene may he modified to eause it to evaporate more elowly. or it may be. if do- .wiied, tendered non-iuilaunmilile by the admixture of a iroper proportion of tetl'uehlorid 'of ear a. After the facing material has been a iplied to the asbestm mass the said mass is ilaeed upon the pattern and rammed. after which the asbestos mold thus obtained is dried or baked.

in the mine of very deep ornamentation, the following method of ap dying the faring material may be employm First laee the asbestos. then ram on, pattern: and should the high and deep pointa break through the faring a further up lieution of the faeing umterial may be applied and another ramming: on the pattern eil'eeted.

instead of using slltttlht f asbestos rape! in build .np a layer or mass of an leient thirkness 1- may employ uabestoa fiber. forming it into a moist mam or pulp with water and paste. and may apply this mass to the pattern under pressure.

I am aware that it has been hitherto proposed to fare asbestos stereotype matrieeo with plant pine. Sueh a lnold will, not however aux-over the panama for whirh my'mold is intended pinee the faeingwould not withatand any considerable degree of heat and would therefore be wholly nutlt for tho ranting of metala commonly employed in the rodnction of high do castings having line ornamentation hereon. I employ I powdered facin material characterized nerally as infaai lit and meombustlblc. ,do not however wiah to luait myself to-tbe up of any partieular infallible and \ncombnat-lble'powderedfneing material ainco I believe myself to be the first )tl't-Ojl to face an unbeatoa mold with a pow cred facing material.

ii' iii l in a on ma 1. mo or p arm to ngl eonaisting of eompreloed minutes, Ind proi l ,i

vided with an inside facing of finely ow- .dered material other than asbestos, sai facin; compressed into the inside face of the mol 9. A mold for metal castings formed of asbestos provided with a facing to receive the molten metal, said facing consisting of material other than asbestos and mixed with a V0 1. e 1 m non-mixa e W1 i water la il l'q 'd bl t! said being capable of receiving an impra-ion rom a pattern and also capable of withstanding a high dc rce of heat.

8. A mold for meta custingsformed of compressed asbestos provided with a facing of suitable nmtcrial compressed mtp the face of the asbestos mold. Q

4. A mold for metal castings formed of compressed sheets of asbestos sha d to the form of the article to be cast an provided with a facing of suitable material mixed 20 with a volatile liquid non-mixable with water.

5. A mold for metal castings formed of compressed asbestos shaped to the form of the article to be cast and provided with a 25 facing of suitable material compressed into the inner face of'the' asbestos material.

In testimonv whereof I aflix my signature, in presence of two witnesses.

iEORGE HALE BRABROOK.

Witnesses:

Wat. A. Macnspn, Amen lLlIomuson. 

